Sound box



V A. LUNDEN.

SOUND BOX. APPLICATlon FILED 1MM), 1922.

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I. A. I UNDEN.'

SOUND 80)(l APPLICATION FILED JAN. 9,1922. www@ 'Patented N0v 28y w22..

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SOUND BOX.

Application filed January 9, 1922. l Serialio. 527,915.`

To all 'w 7mm t may concern.'

Be it lrnown that I, Joa-IN A. LUNDEN, a citizen of the United States of America, residing at Chicago, in the county `oi? Cook and State of Illinois, have invented certain Improvements in Sound Boxes, ol which the following is a specification.

rllhis inventionr relates to that type of sound boxes for phonographs and like sound producing instruments in which the needle or stylus mounting is connectedto the sound producing diaphragm by an angularly disposed bar and is pivotally mounted on the sound box casing, and the present improvement has for its main object .y

To provide a structural formation and association of parts in a stylus mounting whereby a simple and durable pivotal at-` tachment to the sound box casing is attained, in which the vibration of the needle or stylus is effectively conned to a single plane without interference to tree vibration in such plane, and with which lost motion or play at the point ,of pivotal connection 1s etectively prevented as well and any tendency to movement of the parts under either side or torsional stresses `is resisted in an etlicient manner, all as will hereinafter more fully appear.

ln the accompanying drawings Fig. l is a central sectional elevation of a sound box illustrating the preferred arrangement of parts in the present invention.

Fig. 2, is an inverted plan view of the f same. e

Fig. 3, is a front elevation with parts in section on line 3 3, Fig. 2.

Fig. et, is a detail side elevation il1ustrating the pivotal connection of the parts.

Fig. 5, is a detail perspective view of the stylus mounting parts in a detachable condition.

F ig. 6, is a side elevation of a modiiication showing the arrangement of parts in conindicate like nection with an ordinary upright type of by a pin 4 on one part moving vin an elongated curved slot in the wall of thekother part as shown in Fig. l. rlhis feature is usual to many phonographs and permits oi an adjustment of the stylus carrying means ltor `playing either the laterally or the perpendicularly undulating type ot' records as well as attain an adjustment ot the plane et movement of the needle or stylus from the normal right angle relation to the laterally undulating` record groove to a greater or less Obliquity in an adjustment to attain the desired tone from a particular sound record.

6. designates the sound producing diaphragm, peripherally mounted in the open t'ace of the sound box casing by .annular holding rings 7 of yielding material, or by any other means ot attachment usually employed for the purpose.

n 8 designates the styluscarrying post or y stem provided with the usual receiving socket or orifice for the needlek orl stylus 9, with a lateral thumb screw lO by which the stylus 9 is detachably secured in said socket and with a lateral bar or arm l1 extending to and attached in` any usual manner to the center of the diaphragm` 6. Aln the `present improvement the post or stem 8 is'y provided at the end opposite to its socket or orifice with a lateral plate' extension Al2 integrally formed with the postor stein, or otherwise fixedly attached thereto. The other end of the plate extension l2 is formed with an orifice for the passage oiabinding screw 13 by which saidplate extension is rigidly at` tached to a side extension or lug lllot' the sound box casing l, as shown more particularly in Figs. l and 2, and inthe preferred construction shown, the outer end oit the lug lll is `formed witha depending rib 14 the under tace of which altords bearing for the end of theplate extension l2 and provides clearance between the main portion ot such plate `extension and the adjacent face ot the sound boX casing.

n the present improvement ythe plate extension l2 constitutes the resilient `pivotal connection between the sound box casing and the stylus mounting to permit ot the normal vibration of said stylus mounting in actual use. In connection therewith any tendency` to undue lateral swing of the stylus mount ing, with a twisting' action on the plate exe tension l2, is prevented by the following arrangement oi" parts 15 designates side wings of the flat web form shown, extending upwardly in opposite directions from the sides of the stylus car,- rying post or stem 8, with their upper ends in transverse spaced relation to the plate extension 12 aforesaid, and with said upper ends formed with bends 16 of the open hook shape as shown and adapted for rocking or pivotal engagement with the hereinafter described complementary ridges associated with the sound box casing 1.

I7 designates a crescent shape plate having at its mid-length an orifice for the passage of the biiiding screw 13 aforesaid, and by which it is attached to the underside of the plate extension 12 and preferably in spaced relation thereto by means of an intermediate washer or spacing plate 1S, as shown in Fig. l.

19 designates upturned bearing ridges formed on the ends of the plate 17' aforesaid, and having transverse spaced relation corresponding with that of the knuckles 16 of the wings 15 of the stylus carrying post and adapted for interengagement therewith and form a loose rocking pivotal connection for the parts.

The associated bends 16 and bearing ridges 19 have no part in the normal vibratory movement of the stylus mounting to operatev the sound producing diaphragm, and are intended solely to preventundue lateral vibration of the stylus mounting.` In consequence the lit between said bends and ridges is preferably a loose one, as indicated by extended experimental use of the appliance,

and with a view to prevent rattle or noise.

between `the parts a cushioning means Vas follows is employed 2O designates layers of fabric of a wovenk or other nature secured to the under face of the side extensions or lugs 1d of the sound box casing 1A and adapted to have bearing against the upper surfaces of the bends 1G to hold the-same in associated relation to the companion ridges 19 and prevent or dampen any noise. or chatter at the points of pivotal connection during actual use.

21 designates stop lugs or pins depending' from the under side of the sound box casing l in adjacent relation to the inner sides of the lateral wings 16 of the stylus carrying post S and adapted for contact therewith to properly position t-he parts in an assembly ofv the mechanism, as well as to prevent any accidental lateral shifting after assemblage.

I-Iaving thus fully described my invention, what I claim as new and desire to secure by Letters Patent, is z- 1. In combination, asound box casing carrying a diaphragm, a stylus carrying post having a fixedly attached angularly arranged resilient plate extension at one end an-d an angularly arranged bar intermediate of its length and operatively connected to the diaphragm, and means for ixedly attaching` an end of said resilient plate extension to the sound box casing, the stylus carrying postbeing provided with oppositely extending lateral wings having bearing engagementwith va ixed part of the sound box casing to resist lateral vibration of the stylus carrying post.

2. In combination, a sound box casing carrying a diaphragm, a stylus carrying post having a ixedly attached angularly arranged resilient plate extension at one end and an angularly arranged bar intermediate of its length and operatively conneited to the diaphragm, and means for fixedly attaching an end of said resilient plate extension to the sound box casing, the same comprising a transversely arranged confining plate and an attaching screw, the stylus carrying post being provided with opposite y extending lateral wings having bearing engagement with the ends of t ie aforesaid coniningfplate byl inter-engaging bend and ridge formations.

3. In combination, a sound box casing carrying a diaphragm, a stylus carrying post having a iixedly attached angularly arranged resilient plate extension at one end and an angularly arranged bar intermediate of its length and operatively connected to the diaphragm, means for lixedly attaching an end of said resilient plate extension to the sound box casing, the stylus carrying post being provided with oppositely extending lateral wings having bearing enVA gageinent with a fixed part of the sound box casing to resist lateral vibration of the stylus carrying bar, and depending pins on the sound box casing having earing contact with opposed faces of the lateral wings aforesaid, to position the parts.

d. In combination, a sound box casing carrying a diaphragm, a stylus carrying post having a fixedly attached angnlarly arranged resilient plate'extension at one end and an angularly arranged bar intermediate of its length and operatively connected to the diaphragm, means for fixedly attaching an end of said resilient plate extension to the sound box casing, the saine comprisingl a transversely arranged contining plate and an attaching screw, the stylus carrying post being provided with oppositely extending lateral wings having bearing engagement with the ends of the aforesaid conlining plat-e by inter-engaging bend and ridge formations, and depending pins on the sound box casing having bearing contact with opposed faces of the lateralwings aforesaid to position the parts."

Signed at Chicago, Illinois, this 31st day of December, 1921.

JOHN A.. LIJN i EN. 

